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. 2019 Feb 19;10:131. doi: 10.3389/fpls.2019.00131

FIGURE 5.

FIGURE 5

Acetylene reduction activity per single plant and specific acetylene reduction activity per nodule g dry weight on 24 DAP for treatments with control (N-free), nitrate, ammonium, urea, or glutamine for 5 days from 12 to 17 DAP with continuation of growth from 17 to 24 DAP with N-free medium (Experiment 2). (A) ARA per single plant. (B) Specific ARA per g dry weight of nodules. Averages and standard errors are shown (n = 4). Different letters above the column indicate significant differences at <0.05 by Tukey’s test.